backbone bottom brashness brass brazen boldness cheek crust face gall grit guts gutsiness guttiness heart heart of oak heroics hubris improvidence imprudence impudence indiscretion injudiciousness insolence intestinal fortitude mettle nerve overboldness overcarelessness overconfidence oversureness overweeningness pith pluck rashness spirit spunk stamina stout heart temerariousness temerity toughness unchariness unwariness